Refrigeration motor control



Aug. 15,

E. THOMPSON REFRIGERATION MOTOR CONTROL Filed July 23, 1947 g4 Z3 Z Fig. 2

s WITCH 40 s w/ TCH INVENTOR. Edgar Thompson,

A'I'I'D RN EYS Patented Aug. 15, 1950 UNITED STATES PATENT OFFICE 2,519,006 REFRIGERATION MOTOR CONTROL Edgar Thompson, Nolan, W. Va.

Application July 23., 1947, Serial No. 762,965

1 Claim. 1

My present invention relates to an improved selective thermostat control for refrigeration and more specifically to the use of a plurality of thermostatic switches selectively controlled by manual operation to providevarious ranges of temperature for the cabinet.

The control of my invention is especially adapted for commercial use as in stores so that during the winter season the proper range for storage of meats may be effected and during the summer a lower range which may be the proper temperature for ice cream may be employed. With the control of my invention the single refrigerator cabinet may be used with equal facility to provide a, low or high range of temperature by merely moving the single switch lever.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention according to the best mode I have thus fare devised, but it will be understood that various changes and alterations may be made in the exemplified structure within the scope of the appended claim.

In the drawings:

Fig. 1 is a schematic view of the control of my invention as used with a refrigerator cabinet.

Fig. 2 is a detailed diagrammatic view of the control using pressure controlled switches in lieu of thermostatic switches.

Referring now to the drawings wherein I have illustrated the present preferred embodiment of my invention I provide a conventional refrigerating cabinet 2 having insulating means 4 and lids 6 providing access to the interior thereof.

A coil 8 has inlet pipe l and outlet or return pipe [2 from the compressor 14 and the compressor is operated by belt Hi from the electric motor l8. Interpolated in the inlet pipe I0 is the combined condenser and receiver l9 and between the condenser and receiver I9 the reducing valve and evaporator 2| is interpolated in the inlet pipe l0.

Within the cabinet 2 I provide a pair of thermostats 20 and 22 each having tubes 24 and 26 thence to the double throw switch 34 having spaced contacts 36 and 3B, and the selective lever 40. From each contact 36 and 38 wires connect to the switches 28 and 30. which in turn connect with the return power line 42. 1

Thus the thermostats ma control a range of, for instance, respectively 0 to 20 and 20 to 40f. To select the temperature range in the cabinet the switch lever 40 is turned to either contactBB or 38 to bring within the circuit the desired switch. In Fig. 2 the thermostatic switches 28 and 30 have been replaced by pressure controlled switches 29 and 3| respectively. The reducing valve and evaporator 21 have been replaced by the thermostatic switch and evaporator 23. This type of control being used in refrigerating systems of low side float or thermostatic expansion valves whereby the system is set to operate at different pressure settings.

By the use of the device of my invention a single cabinet will serve a dual purpose efiecting economy and giving the store proprietor extra space for seasonal commodities by a simple movement of a switch lever.

Having thus fully described m invention wha I claim as new and desire to secure by Letters Patent is:

The combination with a refrigerator having a condensing unit comprising a compressor and an operating motor and electrical circuit therefore, a plurality of thermostats of different thermal ranges in the refrigerator adapted to selectively control the temperature of the refrigeratona thermostatic responsive switch connected to each of said thermostats, a control switch having a contact for connection to each thermostatic responsive switch, interpolated in the circuit, a control lever for the switch adapted to selectively energize the contacts and actuate the thermostat connected thereto whereby the range of temperature in the refrigerator will be controlled according to the thermal range of the actuated thermostat.

EDGAR THOMPSON.

REFERENCES CITED Number Name Date 2,102,225 Russell et al Dec. 14, 1937 

